Chapter 4 The Role of Melanization and Cytotoxic ByProducts in the Cellular Immune Responses of Drosophila Against Parasitic Wasps ScienceDirect The structural unit of melanin in the cell wall of the fungal pathogen Cryptococcus neoformans Journal of Biological Chemistry Encapsulation and Melanization Are Not Correlated to Successful Immune Defense Against Parasitoid Wasps in Drosophila melanogaster An acral nevus is a benign melanocytic lesion found on the palms and soles. Dermoscopically, it most commonly shows the parallel furrow pattern, where pigmentation follows the furrows of the skin markings.